11. What is the physical device that performs an operation on the signal?
A. Signal source
B. System
C. Medium
D. None of the mentioned
12. Which of the following is done to convert a continuous-time signal into a discrete-time signal?
A. Modulating
B. Sampling
C. Differentiating
D. Integrating
13. The deflection voltage of an oscilloscope is a ‘deterministic’ signal.
A. True
B. False
14. The even part of a signal x(t) is?
A. x(t)+x(-t)
B. x(t)-x(-t)
C. (1/2)*(x(t)+x(-t))
D. (1/2)*(x(t)-x(-t))
15. Which of the following is the odd component of the signal x(t)=e(jt)?
A. cost
B. j*sint
C. j*cost
D. sint
16. For a continuous time signal x(t) to be periodic with a period T, then x(t+mT) should be equal to ___________
A. x(-t)
B. x(mT)
C. x(mt)
D. x(t)
17. Let x1(t) and x2(t) be periodic signals with fundamental periods T1 and T2 respectively. Which of the following must be a rational number for x(t)=x1(t)+x2(t) to be periodic?
A. T1+T2
B. T1-T2
C. T1/T2
D. T1*T2
18. Let x1(t) and x2(t) be periodic signals with fundamental periods T1 and T2 respectively. Then the fundamental period of x(t)=x1(t)+x2(t) is?
A. LCM of T1 and T2
B. HCF of T1and T2
C. Product of T1 and T2
D. Ratio of T1 to T2
19. All energy signals will have an average power of ___________
A. Infinite
B. Zero
C. Positive
D. Cannot be calculated
20. x(t) or x(n) is defined to be an energy signal, if and only if the total energy content of the signal is a ___________
A. Finite quantity
B. Infinite
C. Zero
D. None of the mentioned